Apple II Instant Pascal is an implementation of the Pascal language for the Apple II computer. It's based on the American National Standards Institute (ANSI) version of Pascal, which is in turn based on the original definition of Pascal by Kathleen Jensen and Niklaus Wirth in the Pascal User Manual and Report.
Instant Pascal differs from other versions of Pascal in three major ways: 1. It is interpreted.
2. It is developed, tested, and executed from a mouse-driven programming environment using pull-down menus and multiple windows.
3. It conforms to the IEEE Standard 754 for Floating-Point Arithmetic.